Lou Reed has revealed that his recent collaboration with Metallica was "awe-inspiring".

The musician, who joined forces with the heavy metal band to work on songs he'd written for German theatrical production Lulu, said that the material they created together could be "the best thing done by anyone, ever".

"The version of the Lulu music I did with Metallica is awe-inspiring," Metal Hammer quotes Reed as saying. "It could create another planetary system. I'm not joking, and I'm not being egotistical."

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When asked if they would work on the stage show together, Reed joked: "I don't think Metallica wants to be a band on Broadway! They're metalheads. They're not going to do that."

Metallica recently posted a statement on their website saying: "We are more than proud to announce that we have just completed recording a full-length album that is a collaboration with none other than the legendary Lou Reed. We have been kicking around the idea of making a record together."